33results about "Specific circuit substances" patented technology

A cream solder obtained by kneading an Sn—Ag—Cu alloy together with a flux, wherein the Sn—Ag—Cu alloy includes a mixture of a first powdery alloy and a second powdery alloy, the first powdery alloy is represented by an Sn—Ag phase diagram having a solid-liquid coexistence region and has a given silver amount which is larger than that in the eutectic composition (3.5 wt. % silver), and the second powdery alloy has a silver amount which is that in the eutectic composition (3.5 wt. % silver) or which is close to that in the eutectic composition and is smaller than that in the first powdery alloy. This cream solder has excellent strength and thermal stability, and satisfactory bonding properties. It is based on an inexpensive Sn—Ag—Cu solder alloy. It is suitable for use as a high-temperature-side lead-free solder material conformable to temperature gradation bonding. Also provided is a method of soldering.

To achieve good adherence of a resist coating, more specifically a photo imageable resist coating, to a copper base while ensuring that the copper base being very thin is not compromised, a non-etching non-resist composition for the treatment of the copper base is provided, said composition comprising at least one adhesion agent selected from the group comprising (i) heterocyclic compounds comprising at least one thiol moiety and (ii) quaternary ammonium polymers having the following general chemical formula: {N⁺(R³)(R⁴)—(CH₂)_a—N(H)—C(Y)—N(H)—(CH₂)_b—N⁺(R³)(R⁴)—R⁵}_n2n X⁻, with R¹, R², R³, R⁴, R⁵, Y and X⁻ being defined as claimed.

A solder paste consists of an amount of a first solder alloy powder between 44 wt % to less than 60 wt %; an amount of a second solder alloy powder between greater than 0 wt % and 48 wt %; and a flux; wherein the first solder alloy powder comprises a first solder alloy that has a solidus temperature above 260° C.; and wherein the second solder alloy powder comprises a second solder alloy that has a solidus temperature that is less than 250° C. In another implementation, the solder paste consists of an amount of a first solder alloy powder between 44 wt % and 87 wt %; an amount of a second solder alloy powder between 13 wt % and 48 wt %; and flux.

A ceramic circuit board of laser plate copper and manufacturing method thereof is provided. The method includes: providing a ceramic substrate; laser engraving, on a surface of the ceramic substrate, so as to form a circuit pattern of a plurality of groove structures; roughening and activating, on the surface of the ceramic substrate, by washing the surface of the ceramic substrate with a roughening and activating solution; and plating a metal layer, on the groove structures, so as to form a conductive loop defined by the circuit pattern.

Provided are methods of forming thermally conductive flexible bonds for use in electronic boards of unmanned spacecrafts and other types of aircraft. Also provided are methods of preparing adhesive materials to form these bonds including methods of preparing treated filler particles. In some aspects, an adhesive material includes filler particles having organofunctional groups, such as boron nitride particles treated in silane. These particles may be combined with a urethane modified epoxy to form the adhesive material. The weight ratio of the particles in the adhesive material may be about 40-60%. The adhesive material may be thermally cured using a temperature of less than 110°C to prevent damage to bonded electronic components. The cured adhesive may have a thermal conductivity of at least about 2 W/m K measured in vacuum and may have a glass transition temperature if less than -40°C.

Optical stacks containing one or more patterned transparent conductor layers may be damaged by electrostatic discharges that occur during the optical stack manufacturing process. Such damage may result in non-conductive conductors within the patterned transparent conductor layer. An electrostatic discharge protected optical stack may include a substrate layer, a first anti-static layer having a sheet resistance of from about 10⁶ ohms per square (Ω/sq) to about 10⁹ Ω/sq, and a patterned transparent conductor layer. Methods of testing and assessing damage to patterned transparent conductors are provided.

The present invention is directed to flux compositions and uses thereof. One composition comprises an activator and a solvent being a glycerol ethoxylate with a molecular weight of 200-500. Another composition comprises an activator, a solvent being a glycerol ethoxylate with a molecular weight of 200-500 and an amine. A soldering method for joining objects is also provided, comprising the steps of applying a flux composition to at least a portion of one or more of the objects, and joining the objects.

The invention relates to a rigid-flexible printed circuit board. The rigid-flexible printed circuit board comprises a flexible printed circuit board, wherein the flexible printed circuit board comprises a flexible printed circuit board base material and a first conductive circuit layer formed on at least one surface of the flexible printed circuit board base material, a double-sided adhesive filmformed on the surface of the first conductive circuit layer, a dielectric layer formed on the double-sided adhesive film, an outer layer conductive circuit layer formed on the surface of the dielectric layer, and a conductive hole, wherein the double-sided adhesive film comprises an insulating layer, and a first bonding layer and a second bonding layer, wherein the first bonding layer and the second bonding layer are formed on the two opposite surfaces of the insulating layer; the first bonding layer is in contact with the first conductive circuit layer; the dielectric layer comprises a firstopening, wherein the first opening exposes a part of the second bonding layer to form a flexible printed circuit board region; the conductive hole penetrates through the outer layer conductive circuitlayer to the first conductive circuit layer; and the outer layer conductive circuit layer is electrically connected with the first conductive circuit layer through the conductive hole.

A method of forming a heating element includes depositing a conductive ink of silver particles in an epoxy resin on a dielectric film to create a conductive circuit, and heat curing the conductive circuit to achieve a resistivity of the heating element less than 1.68×10⁻⁶ ohm·meter. An aircraft heated floor panel includes at least one floor panel of an aircraft includes a conductive circuit positioned within the floor panel having a conductive ink of silver particles in an epoxy resin on a dielectric film.

A conductive paste including: (A) a silver powder; (B) a glass frit; (C) an organic binder; and (D) a powder containing copper, tin, and manganese.

Even if the strength of a solder composition close to a SnBi eutectic composition was improved, it was brittle, so when it was used for small electronic devices such as mobile phones or notebook computers, the resistance to drop impacts when the small electronic equipment was dropped was low. Therefore, interface peeling often took place between the soldered surface and a printed circuit board, resulting in the devices being destroyed. As disclosed, when soldering using a solder paste containing a SnBi-based low-temperature solder, at least one type of solder composition selected from a Sn—Ag, a Sn—Cu, and a Sn—Ag—Cu solder composition is diffused into the solder paste by simultaneously supplying at least one type of preform selected from a Sn—Ag, a Sn—Cu, and a Sn—Ag—Cu solder composition, whereby resistance to drop impacts is improved.

The present invention provides a manufacturing method of a printed circuit board and a printed circuit board. According to the manufacturing method of the printed circuit board, after a first core board is patternized, a first hole is formed at the predetermined position of the first core board by means of drilling; the first hole is filled with a decomposable material; the first core board and the other core board are laminated, and a second hole is formed at the same position with the first hole; the diameter of the first hole is larger than the diameter of the second hole, so that after thedrilling of the second hole is completed, the decomposable material is still left on the hole wall of the first core boar, and therefore, palladium can be deposited on the decomposable material afterpalladium activation treatment is carried out in a PTH process; and after the decomposable material is decomposed, the palladium is removed, so that a copper layer cannot be formed on the surface ofthe hole wall of the first core board during copper deposition and copper electroplating.

The present application provides a non-inductive scratch repair process for circuit boards. The above-mentioned non-inductive rubbing repair process for circuit boards includes the following steps: obtaining untreated walnut kernels; performing a first rolling operation on the walnut kernels to obtain walnut kernel mud; adding Vaseline to the walnut kernel mud for a second rolling operation , to obtain mixed walnut kernel paste; solidify and form the mixed walnut kernel paste to obtain a non-inductive scratch restoration; obtain a circuit board after solder masking, wherein there are non-inductive scratches on the solder mask layer of the circuit board; Squeeze and wipe the circuit board after the solder resistance with the scratch-scratch restoration body to obtain the repaired circuit board. The above-mentioned non-inductive scratch repair process for circuit boards can better repair the non-inductive scratches and improve the appearance of the circuit board.

The present invention provides a circuit board with a shielding structure and a preparation method thereof. The circuit board includes: a first shielding layer, a second shielding layer, a circuit layer arranged between the first shielding layer and the second shielding layer, a first insulating layer arranged between the circuit layer and the first shielding layer, and a second insulating layer arranged between the circuit layer and the second shielding layer. The second shielding layer and the second insulating layer are arranged on the circuit layer and are smaller than the circuit layer in size. When the second shielding layer and the second insulating layer cover the circuit layer, at least one edge part of the circuit layer is exposed outside the second shielding layer, and the exposed edge part is provided with a plurality of metal electrodes connected to an external circuit board. According to the technical scheme of the present invention, shielding layers are arranged on two sides of the circuit layer so that a shielding processing to a circuit does not require a shielding cover; and the metal electrodes for connection on the circuit layer are exposed outside the insulating layer directly so as to avoid parasitic capacitances, and an anti-interference function of the circuit board is greatly enhanced.